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Calculating required server capacity

Use the estimated bandwidth requirement and the estimated audience volume to determine how much capacity your network and server system must have to accommodate demand.

To estimate the total required server capacity, multiply the required bit rate per user by the estimated audience volume. The actual capacity of a given server will vary from computer to computer. As a general rule, a single processor (233 megahertz) computer with 256 MB of RAM that is running Windows Media Services can serve up to 1,000 28.8 Kbps unicast streams.

The following table demonstrates the need for additional server capacity as the number of users and content bit rate increases.

Bit rate of stream (Kbps) Type of network connection Number of concurrent users per server
28.8 (20 actual) Telephone modem 1,200
56.6 (33 actual) Telephone modem 600
100 ISDN 300
300 DSL/cable/LAN 100

For example, if online training content is delivered at a bit rate of 300 Kbps to 500 concurrent users, the server system and network must be capable of handling 150 megabits per second. If the server meets the minimum requirements for running Windows Media Services, at least six Windows Media servers would be required to service this demand.

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